Cheat sheet · JEE Preparation Physics
Electromagnetic Waves cheat sheet
The whole chapter on one page: key formulas, facts and the points to remember, for quick revision before a test.
JEE · Physics
Cheat sheet
Class 12 · Chapter 8Electromagnetic Waves
Radio, Micro, IR, Visible, UV, X, Gamma — “Raging Martians Invaded Venus Using X-ray Guns”.
1. Properties
- Produced by accelerated charges.
- E and B oscillate ⊥ to each other and to propagation.
- Transverse; need no medium.
Displacement current (Maxwell).
2. EM Spectrum
| Wave | Wavelength | Use |
|---|---|---|
| Radio | 0.1 m | broadcasting |
| Microwave | 1 mm – 0.1 m | radar, ovens |
| Infrared | 700 nm – 1 mm | remote controls, heating |
| Visible | 400–700 nm | vision |
| Ultraviolet | 1–400 nm | sterilisation |
| X-rays | 0.01–10 nm | medical imaging |
| Gamma rays | < 0.01 nm | cancer treatment |
3. Key Points
- EM waves carry energy and momentum.
- Ozone absorbs UV.
- Greenhouse effect involves IR.
- Hertz first produced EM waves.
Remember: Displacement current | c = 1/√(μ₀ε₀) | spectrum order
Electromagnetic Waves: questions and notes
More JEE Preparation Physics cheat sheets
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- Laws of Motion
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- Gravitation
- Mechanical Properties of Solids
- Mechanical Properties of Fluids
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- Thermodynamics
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- Oscillations
- Waves
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